<div class="col-12 col-lg-12">
    <div class="card">
        <div class="card-header">后台用户管理</div>
        <div class="tab-container">
            <ul role="tablist" class="nav nav-tabs">
               {{$nav}}
            </ul>
            <div class="tab-content">
                {{$body}}
            </div>
        </div>
    </div>
</div>